<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/reset.js"></script>
</head>
<body>
    
    <style>
        .trail { /* className for the trail elements */
          position: absolute;
          height: 6px; width: 6px;
          border-radius: 3px;
          background: teal;
        }
        body {
          height: 300px;
        }
      </style>
      
      <script>
        // Your code here.
      </script>

</body>
</html>